Gearbox



FIG. 1 is a top, front, right perspective view of a gearbox, showing our new design;

FIG. 2 is a bottom, rear, left perspective view thereof;

FIG. 3 a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is right side elevation view thereof;

FIG. 6 is left side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

CLAIM The ornamental design for a gearbox, as shown and described. 